HTML5 JS压缩图片并获取图片BASE64编码上传

var vueImg = new Vue({
    el: "#divCarImages",
    data: { model: { carId: '@carId', imageTitle:'',img64:'' }, images: [] },
    methods: {
      imageHandle: function () {
        var fup = $("#fileImg")[0];

        var img = fup.files[0];

        var image = new Image();
        var canvas = $("#canvas")[0];//document.createElement("canvas");
        var ctx = canvas.getContext('2d');

        image.onload = function () {
          var w = image.naturalWidth,
            h = image.naturalHeight;

          var toSize = 400;
          canvas.width = toSize;
          canvas.height = toSize;

          var w2 = toSize, h2 = toSize;
          if (w > h) {
            h2 = h / w * toSize;
          } else {
            w2 = w / h * toSize;
          }

          ctx.drawImage(image, 0, 0, w, h, 0, 0, w2, h2);
           
        }

        // 判断是否图片
        if (!img) {
          return;
        }

        // 判断图片格式
        if (!(img.type.indexOf('image') == 0 && img.type && /\.(?:jpg|png|gif)$/.test(img.name))) {
          alert('图片只能是jpg,gif,png');
          return;
        }

        var reader = new FileReader();

        reader.onload = function (e) { // reader onload start
          var url = reader.result;
          image.src = url;

        } // reader onload end

        reader.readAsDataURL(img);
      }

    }
  });

function uploadImg() {
    var canvas = $("#canvas")[0];
    vueImg.model.img64 = canvas.toDataURL("image/jpeg", 0.1);
    //$("#testMsg").html(imgData.length);
           
    // ajax 上传图片
    $.post("@Url.Content("~/AliOss/SaveCarImage")", vueImg.model , function (ret) {

      parseAjaxData(data, function (model) {
        console.log(model.Path);
        alert(model.Path);
        $('#showimg').html('<img src="' + model.Path + '">');
      })    
    }, 'json');
  }